Below are a few ideas that I think would be useful if implemented. Most of them are simply QoL changes, while others are more of an alteration on existing mechanics. I understand that many will not agree with these, and that's totally okay, feel free to add your thoughts on things you'd like to see.
Track Achievements:
This became far more desirable for me when I leveled up my tank. I am currently pursuing the Battle Bear mount, and opening up the Achievements menu and scrolling down after every dungeon gets tedious. I am aware that it's about 15 seconds (if that) of fidgeting to find it, but it would be a nice change to monitor your progress in real time.
Socializing in Duty Finder:
It's time to remove the restrictions on whispers and accessing your friends list in Duty Finder. For those that wish to remain in the black out, there can be an option that allows the player to continue not receiving messages. You can even take it a step further and make the current restrictions only apply to your first time in a duty. That way their focus is solely on the duty itself.
Friends list:
In addition to the Duty Finder restriction being lifted, I'd like to see a notification when people on our friends list logs in or out. I searched for an option to make this happen and could not find anything.
More glamour for male characters:
This game has a ton of female characters in it. As a consequence, many of the armor sets are tailored more toward the feminine (a good example of this is the Alphascape healing chest). As it stands, male characters don't have a lot of options for armor sets that aren't dresses, or floral patterned robes, or some outfit with a huge bow on the back, etc. I understand this may trigger some people because it's 2k19 and that's the new thing, but understand that this is a game, and I'd like my male warrior to not look like it just came from a drag show.
More male Miqo'te faces:
As it stands, there are very few to choose from. Out of those few, 3 of them look like they're taken from a 12 year old boy. The only one that looks as if it's an adult face has markings that you cannot remove.
Additional timed retainer missions:
Currently, we have a choice of 1 hr or 18 hr. A 10 hr mission would be a good addition to the list. My reasoning for this is to set the mission before bed, and check it when you wake up, plus or minus one hour.
One large bag for retainers:
I would like to be able to talk to my retainer and open one large bag, rather than 5 small ones; it gets very irksome when trying to find something in them. Same amount of space, just exposed in one window.
Inventory search feature:
Please, please, please add in an inventory search feature (not to be confused with "Search for Item"). My bags become so crowded with things (especially if I'm out gathering or crafting), that when it comes time to find stuff, I have to scroll over each item and check their name. While the sort option is very handy, there are some items that sort just can't help locate. Example: before I knew what Minium was, I was looking for it in my bags. I have no idea that it was red sand on paper. The icon just looked like a letter with one of those wax seals on it. Sounds ridiculous, I know, but I can't be the only person who encounters issues like this.
While I know that these will never come to pass, I wanted to express my hopes for some helpful adjustments. Thanks for your time!